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"Where do you get your protein?"
That's the question. The one question. Every vegan on Earth has heard it so many times that we could tattoo the answer on our foreheads and people would still ask. But here's the thing — protein isn't actually the nutrient you need to worry about on a vegan diet. It's the one everybody thinks they need to worry about because the meat industry spent decades making sure you'd ask that question instead of the ones that actually matter.
I've been vegan for years. My bloodwork is better than most meat-eaters I know. But it didn't happen by accident. It happened because I actually learned what my body needs — something most people, vegan or not, never bother to do.
So here's the real deal. Not the sanitized, Wikipedia-style nutrient list. The honest, practical guide to the handful of things you genuinely need to pay attention to — and the many, many things you don't.
B12: The Only Supplement You Actually Need
Let's get this one out of the way first because it's the only nutrient where I'll say: yes, take a supplement. No debate.
Vitamin B12 is made by bacteria in soil and water. Animals get it because they eat off the ground or drink untreated water. We used to get it the same way, before we started sanitizing everything. Now, fun fact: 39% of Americans are low or deficient in B12 regardless of diet, according to a Framingham Offspring Study analysis. It's not a vegan problem. It's a modern food system problem.
But vegans are more at risk because we've cut out the middleman (the animal) who got their B12 from the same bacteria we could've gotten it from directly. So take a supplement. 2,500 mcg of cyanocobalamin once a week, or 250 mcg daily. Done. Costs about $8 a year. That's cheaper than a single steak dinner.
Pawlak et al. (2016) in the European Journal of Clinical Nutrition reviewed B12 status across vegetarians and found that supplementation completely eliminates deficiency risk. Problem solved.
Iron: You're Probably Fine
Here's where it gets interesting. People assume vegans are anemic. The data says otherwise.
Yes, plant iron (non-heme) absorbs less efficiently than animal iron (heme). But your body actually regulates non-heme iron absorption based on need — it absorbs more when your stores are low and less when they're full. Heme iron doesn't have that safety mechanism, which is why excess heme iron from meat is linked to colorectal cancer (World Cancer Research Fund, 2018).
My iron sources: lentils, chickpeas, tofu, dark leafy greens, pumpkin seeds. The trick is pairing them with vitamin C — squeeze lemon on your lentil soup, throw bell peppers in your stir-fry. Hunt (2003) in The American Journal of Clinical Nutrition showed that vitamin C can increase non-heme iron absorption by 3–6x. Many of these iron-rich staples are legumes that have sustained human civilizations for millennia.
I get my iron checked annually. It's consistently in the normal range. No supplements needed.
Omega-3s: Skip the Fish, Go Straight to the Source
Fish don't make omega-3s. Let that sink in. Fish accumulate DHA and EPA by eating algae — or by eating smaller fish that ate algae. They're the middleman. You can skip them entirely.
For ALA (the plant omega-3): 1 tablespoon of ground flaxseed or chia seeds daily gives you more than enough. I throw flaxseed into my morning oatmeal every single day. Walnuts and hemp seeds work too.
For DHA and EPA directly: algal oil supplements. Same omega-3s the fish got from algae, minus the mercury, microplastics, and contribution to ocean ecosystem collapse. Sanders (2009) in Prostaglandins, Leukotrienes and Essential Fatty Acids confirmed that algal-derived DHA effectively raises blood levels. For more on why plant-based omega-3 sources outperform fish-derived alternatives, I wrote a whole piece on it.
Calcium: The Dairy Industry's Biggest Con
Got milk? Don't need it.
The countries with the highest dairy consumption — the US, Sweden, Finland — also have the highest rates of osteoporosis. That's not a coincidence; it's a clue. The Harvard Nurses' Health Study followed 72,000 women for 18 years and found no protective effect of dairy on fracture risk. None.
Calcium is everywhere if you know where to look: fortified plant milks (most have the same or more calcium than cow's milk), tofu made with calcium sulfate (half a cup = 43% of your daily needs), tahini, collard greens, bok choy, almonds. Weaver et al. (1999) in The American Journal of Clinical Nutrition demonstrated that calcium from kale and bok choy actually absorbs better than calcium from dairy.
The dairy industry spent $200+ million per year on the "Got Milk?" campaign. That's not education. That's marketing masquerading as nutrition science.
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Vitamin D: Nobody Gets Enough (Vegan or Not)
This one's barely a vegan issue. An estimated 42% of American adults are vitamin D deficient, according to a 2011 study in Nutrition Research. Meat-eaters, vegetarians, vegans — doesn't matter. If you live above the 37th parallel (that's basically everyone north of Los Angeles), you're probably not getting enough from sunlight alone between October and April.
I take 2,000 IU of vitamin D3 daily from October through March. Vegan D3 from lichen exists now — no sheep's wool lanolin needed. In summer, 15–30 minutes of sun exposure handles it. Fortified plant milks help year-round. Holick (2007) in the New England Journal of Medicine called D deficiency a "pandemic" — and that word was appropriate long before 2020.
Zinc and Iodine: The Quiet Ones
Zinc gets overlooked, but it matters. Legumes, nuts, seeds, and whole grains are good sources. Soaking and sprouting grains and legumes reduces phytates (which can inhibit zinc absorption). Foster and Samman (2015) in the Medical Journal of Australia found that well-planned vegan diets meet zinc requirements without supplementation.
Iodine is trickier. If you don't use iodized salt (and a lot of people use sea salt or pink salt instead, which have minimal iodine), you might run low. Seaweed is a powerful source — nori, kelp, wakame — but be careful with kelp, which can have too much. I use iodized salt in cooking and eat nori sheets as snacks. Problem solved.
The Bottom Line
Here's my actual supplement stack as a vegan: B12, vitamin D in winter, and algal omega-3. That's it. Three things. Total cost: maybe $15 a month.
Everything else — protein, iron, calcium, zinc, iodine, selenium (two Brazil nuts a day, done) — comes from food. Real food. Lentils, beans, tofu, tempeh, nuts, seeds, whole grains, fruits, vegetables. The same foods that fueled athletes and civilizations for thousands of years.
Is a vegan diet nutritionally complete? The American Dietetic Association said yes in 2009. The British Dietetic Association said yes. The Australian National Health and Medical Research Council said yes. The largest organization of nutrition professionals on Earth says a well-planned vegan diet is appropriate for all stages of life, including pregnancy, lactation, infancy, childhood, and adolescence.
So the next time someone asks where you get your protein, smile and ask them where they get their fiber. (Spoiler: 95% of Americans don't get enough. The vegans aren't the ones with the deficiency problem.)
References
- Pawlak, R., Lester, S. E., & Babatunde, T. (2016). B12 deficiency in vegetarians. European Journal of Clinical Nutrition, 70(8), 867–873. DOI
- Hunt, J. R. (2003). Iron bioavailability from vegetarian diets. AJCN, 78(3), 633S–639S. DOI
- Sanders, T. A. B. (2009). DHA status of vegetarians. PLEFA, 81(2–3), 137–141. DOI
- Weaver, C. M. et al. (1999). Calcium from vegetarian diets. AJCN, 70(3), 543S–548S. DOI
- Foster, M. & Samman, S. (2015). Zinc in vegetarian diets. MJA, 202(1), 29–33. DOI
- Holick, M. F. (2007). Vitamin D deficiency. NEJM, 357, 266–281. DOI
- World Cancer Research Fund (2018). Heme iron and colorectal cancer risk.
- Framingham Offspring Study. B12 status in Americans.
- Harvard Nurses' Health Study. Dairy and fracture risk (72,000 women, 18 years).
- American Dietetic Association (2009). Position on vegetarian diets.
- Forrest, K. Y. & Stuhldreher, W. L. (2011). Vitamin D deficiency prevalence. Nutrition Research, 31(1), 48–54.